$XPeng Inc.(XPEV)$ jumps 10% after its Tech Day 2023 unveiled groundbreaking advancements in electric vehicles and related technologies.The event showcased the X9 multi-purpose vehicle (MPV) with rear-wheel steering, XNGP autonomous driving technology expanding to 50 cities, and the AI Valet Driver, enabling autonomous city driving along learned routes.XPeng introduced the X9, the world's sole MPV with standard rear-wheel steering, features integrated aluminum body die-casting technology and XNGP, an advanced autonomous ADAS feature.XPeng's eVTOL affiliate AeroHT presented two groundbreaking flying car innovations. The first is a passenger EV with a foldable flight system, enabling vertical take-off—a true "flying car." The second is an EV with 6×